If Early Native Americans Who Originated in North Asia Had

If early Native Americans who originated in North Asia had remained the only ancestral settlers in North America,rather than the overwhelming mixture of immigrants from across Europe and other continents,today there would be a much higher incidence of North Asian traits in the U.S.population.Such a scenario would demonstrate

A) gene flow from continent to continent.
B) the founder effect.
C) genetic drift among the original Northern Asians.
D) fitness for the North American environment.

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